"Failed to mount: zul.wnd.Messagebox is undefined" when setting new Template to Messagebox

[Mosarator]

Hi.

In my code i try to have a scrollable messagebox, without implementing a new one.

So i used

Messagebox.setTemplate(TEMPLATE_PATH);

to set it to an almost identical messagebox.zul (copied from this repository) with the following difference:

			<div sclass="z-messagebox"
				style="max-height:225px;overflow-x:hidden;overflow-y:auto">
				<label value="${arg.message}" multiline="true" 
				w:onBind="zul.wnd.Messagebox.onBind(this,350)"/>
			</div>

But whenever a messagebox is popped i get: "Failed to mount: zul.wnd.Messagebox is undefined"

If i don't change the template that error does not happen.
If i leave the w.onBind, i get no buttons.